Cooling Tower

ABSTRACT

Systems and method for delivery and positioning of a sheet-like surgical implant to a target site including a means of deploying and orienting the sheet-like implant within body.

This application claims priority to U.S. Patent Application 62/453,853 filed Feb. 2, 2017.

FIELD OF THE INVENTIONS

The inventions described below relate to the field of sheet-like surgical implants.

BACKGROUND OF THE INVENTIONS

Biologic constructs and other sheet-like surgical implants are growing rapidly in popularity for the repair of joint pathologies. “Biologic constructs” are a family of biologically derived implants to promote tissue growth or to patch and repair tissue defects and tears. These can be used in the repair of arthritic cartilage, the joining of tendons to bone and the bridging of degenerated rotator cuff in the shoulder. Biologic constructs, which include “regenerative tissue matrices” “acellular tissue matrices” or “collagen scaffolds” and other such substances, are small sheets or disks of flexible, engineered biomaterial, such as collagen or fibrin, decellularized dermal matrix crosslinked and sterilized xenograft tissues, and “platelet-rich-plasma” patches sometimes totally devoid of living cell material and sometimes loaded with active adjuncts such as biologic growth factors. Biologic constructs may also be tissue-engineered from mesenchymal stem cells. For the purposes of this application, the term biologic construct refers to any sheet-like or disc-like configuration of regenerative tissue matrix, acellular tissue matrices or collagen scaffolds, or similar materials suitable for placement within the body to promote healing.

Biologic constructs now occupy an increasingly important place in the orthopedic surgeons armamentarium. One of the key problems with biologic constructs is that the delivery instrumentation has not kept pace with advances in these implants. Positioning and alignment is particularly an issue. For example, the biologic constructs are often seeded with cells on only one side, and its very important to attach these implants with cells side down or they will not work. However, both sides look almost the same so its easy to make the mistake of placing them wrong side down.

SUMMARY

The systems and methods described below provide for delivery and positioning of sheet-like surgical implants adjacent to body tissue. The delivery system has a delivery tube assembly and a drive handle. The delivery tube assembly includes a pushrod shaft with resiliently expandable deployment arms positioned at the distal end of a pushrod shaft. The sheet-like implant is releasably secured to the deployment arms. The sheet-like implant is secured to the arms, and the assembled arms and implant are compressed to fit into the delivery tube, and the delivery tube is inserted into the body.

The system is modular, with separable drive handle and delivery tube assembly. The delivery system can be equipped with fluid or gas management through the delivery tube assembly. The delivery tube assembly provides for articulation, via either flexible or hinged deployment, which is especially useful in hernia repair.

This system may be used for both biologic construct delivery in arthroscopy as well as other sheet and scaffold repair procedures. The system may be used for any soft tissue repair procedure where a synthetic or biologic patch is used, such as joint repair or hernia repair. A method for positioning the sheet-like surgical implant adjacent to body tissue is also described.

BRIEF DESCRIPTION OF THE DRAWINGS

FIGS. 1a and 1b illustrate the sheet-like implant delivery system.

FIGS. 2a through 2f illustrate detailed views of the sheet-like implant folded on the deployment arms.

FIGS. 3a and 3b illustrate a sheet-like implant delivery system with integrated fluid management.

FIGS. 4a through 4c illustrate a sheet-like implant delivery system with a straight handle and slider actuator.

FIGS. 5a through 5d illustrate sheet-like implant delivery systems with articulation.

FIG. 6 illustrates a sheet-like implant delivery system with integrated fluent delivery.

FIGS. 7a and 7b illustrate a sheet-like implant delivery system with thumb and finger loop handle.

DETAILED DESCRIPTION OF THE INVENTIONS

FIGS. 1a and 1b illustrate a sheet-like implant delivery system 1 comprising a delivery tube assembly 2 and a drive handle 3. The delivery tube assembly 2 comprises a pair of deployment arms 4 attached to the distal end of a pushrod shaft 5. The pushrod shaft 5 is slidably disposed within a delivery tube 6. The delivery tube 6 has a retainer feature (flange 7) for engagement with the drive handle 3. The deployment arms 4 are retractable, and may be retracted proximally within the delivery tube 6, and are resiliently biased toward the open configuration shown in FIG. 1a , and may be compressed and drawn down to a closed configuration, smaller than the lumen of the delivery tube, when pulled into the delivery tube 6.

The drive handle 3 (or pistol grip) comprises a deployment trigger 8, a spring 9, a retainer slot 10, a drive yoke 11 and a guide slot 12. Engagement between the delivery tube assembly and the drive handle is created by slipping the pushrod shaft into the longitudinally oriented push rod guide slot 11L and pushing the pin 5P into the transverse slot 11T of the yoke, and slipping the delivery tube retainer feature (flange 7) into the drive handle retainer slot 10. As illustrated, the delivery tube assembly is releasably attached to the drive handle (that is, the delivery tube assembly can be quickly attached to and detached from the drive handle without using tools such as screw drivers or wrenches).

The delivery tube assembly 2 allows for a range of implant sizes in one system usable with a common drive handle 3. For example, the deployment arms 4 may be smaller or larger, depending on the size of the implant. The device may be provided in kits, with a single handle and several delivery tube assemblies with deployment arms and/or biologic patches of different sizes, which may be chosen for use by a surgeon during surgery, to suit the actual natural or surgically altered anatomy of a particular patient. The diameter of the delivery tube can be larger or smaller to accommodate the size of the deployment arms. The delivery tube assembly 2 and the drive handle 3 may be disposable or reusable.

FIGS. 2a through 2c show a close up of the deployment arms 4 with an attached sheet-like implant 13. The sheet-like implant 13 is inserted in a slot 14 within each deployment arm 4, slidably engaging the slots and thus detachably secured to the deployment arms 4. The longitudinal slot 14 runs substantially the length of the deployment arm and each slot is sized to hold a portion of the sheet-like implant by a friction fit between the deployment arm slots and the sheet-like implant. Clamps may also be used to attach the implant to the arms. The sheet-like implant 13 is folded or rolled as shown in FIGS. 2a through 2d and compressed and loaded within the delivery tube 6 of the delivery system 1. The deployment arms 4 and pushrod shaft 5 are positioned within the delivery tube 6. The pushrod shaft 5, with the components assembled, is pulled proximally through the delivery tube 6 prior to delivery into a surgical space. The sheet-like implant folds when the user retracts the deployment arms. Alternatively, the user may manually fold and roll the implant around the deployment arms prior to retraction within the delivery tube.

As shown in FIGS. 2d through 2f , deployment of the implant is performed by manipulating the trigger 8 in the drive handle 3 to extend the pushrod 5 distally from the delivery tube 6 (or pull the delivery tube proximally, depending on the construction of the handle). Upon full deployment distally from the delivery tube, the implant is drawn flat by the resilient expansion of the deployment arms 4. The sheet-like implant is positioned flat in the desired position and sutured or staked in place (with other instruments if necessary) or glued in place. Upon positioning and release of the implant, the arms are retracted proximally through the delivery tube and the delivery system is withdrawn from the surgical site.

The deployment arms are made of a resilient material (spring metal, nitinol, or plastic) such that they spring open when deployed distally from the distal end of the delivery tube. A first deployment arm and a second deployment arm each have a proximal and a distal end with the proximal end of each arm coupled to the distal end of the pushrod shaft. The first and second deployment arms are moveable between a closed position and an open position wherein in the closed position the arms extend generally in the longitudinal direction and in pivoting to the open position the distal end of each arm moves in a generally transverse direction to spread the sheet-like implant. The distal segments of the arms are arranged in roughly a parallel fashion and a proximal segment of each arm bends toward the center of the tube to join the pushrod shaft at their proximal ends. An optional holder 25, as shown in FIGS. 2E and 2F, may be provided to help hold the implant in place while the deployment arms are retracted. The holder shaft may be disposed in a lumen of the pushrod shaft or the delivery tube, and longitudinally translatable within the lumen, extendable distally to the sheet-like implant and operable to hold the implant in place.

The delivery tube is rotatable around the pushrod shaft. This allows the user to manipulate the deployment arms and thus, place the sheet-like implant in a desirable position. For example, the user can orient a biologic construct so that the correct side (for example seeded with cells) is placed correctly on the tissue to be treated.

FIGS. 3a and 3b show the implant delivery system with integrated fluid management. A fluid manifold 15 is attached in fluid communication with the implant delivery tube assembly. The fluid manifold provides for fluid inflow and fluid outflow. Fluid inflow enters in through the distal end 16 of the device between the deployment arms and fluid outflow exits from an aperture 17 in the sidewall of the delivery tube. Separate channels may be provided for inflow and outflow. The fluid can be saline (as in a standard arthroscopic technique) or gas (to be compatible with a tissue adhesive such as fibrin glue).

The implant delivery system can have a straight handle 18 with slide actuator 19 as shown in FIGS. 4a through 4c . The pushrod shaft is drawn proximally and extended distally by the user correspondingly manipulating the slider actuator in a proximal and distal direction.

FIGS. 5a through 5d show an implant delivery system with articulation. FIGS. 5a and 5b show a delivery system where the pushrod shaft is a flexible of bendable shaft 20. Flex control is performed via a rotating wheel 21 controlled by the drive handle. FIGS. 5c and 5d show a hinged pushrod 22 controlled by a rotating wheel 22.

FIG. 6 shows the implant delivery system with a system for delivering a fluent medication to the surgical site (for example, tissue adhesives, stem cells, platelet rich plasma (PRP) or medications). Fluent medications are injected from the fluid source in fluid communication with the delivery tube assembly using a pump or syringe 23 operably connected to a delivery needle or catheter 24, which is inserted through the delivery tube assembly. The fluent delivery can be used, for example, to place a tissue adhesive under the biologic construct for fixation. The fluent delivery can apply stem cells or PRP to the side of the biologic construct contacting the tissue (tendon, cartilage) to be treated.

FIGS. 7a and 7b show an alternate drive handle 25 and delivery tube assembly 26. The drive handle has thumb 27 and finger loops 28, which allow the user to exert reverse force on the drive handle to retract the delivery arms back into the delivery tube.

In use, the surgeon delivers the implant to a joint within the body of a patient by creating an arthroscopic workspace around the joint and inserting a cannula through the skin of the patient proximate the arthroscopic workspace. The surgeon attaches the implant 13 to the deployment arms 4 and retracts the pushrod shaft 5 with the sheet attached to the deployment arms such that the deployment arms and sheet fit through the delivery tube within the cannula. The surgeon inserts the delivery tube assembly through the cannula and into the arthroscopic workspace. The surgeon pulls the drive handle deployment trigger, thus pushing the pushrod shaft 5 in a distal direction to extend the deployment arms and sheet within the workspace and positioning the sheet proximate an intended site of implantation.

The surgeon then secures the sheet to body tissue within the workspace. The implant is secured with staples, sutures, clips or other means, with a separate instrument. The implant may also be secured with a tissue adhesive deliverable through the delivery tube assembly (as shown in FIG. 6) or a separate instrument. Once the implant is essentially staked in place, the surgeon releases the implant from the deployment arms by sliding the arms proximally, whereupon the implant is slidably released from the arms, and the arms withdrawn proximally into the delivery tube. The surgeon retracts the pushrod shaft within the delivery tube and removes the implant delivery system from the workspace.

While the preferred embodiments of the devices and methods have been described in reference to the environment in which they were developed, they are merely illustrative of the principles of the inventions. The system is modular, with separable drive handle and delivery tube assembly. Alternatively, the system can be assembled as a single unit. The elements of the various embodiments may be incorporated into each of the other species to obtain the benefits of those elements in combination with such other species, and the various beneficial features may be employed in embodiments alone or in combination with each other. Other embodiments and configurations may be devised without departing from the spirit of the inventions and the scope of the appended claims. 

We claim:
 1. A delivery system for delivering a sheet-like implant to a surgical site, said delivery system comprising: a delivery tube assembly, said delivery tube assembly comprising: a delivery tube characterized by a distal end and a proximal end and a lumen extending from the proximal end to the distal end; and a first deployment arm, said first deployment arm having a distal end and a proximal end; a second deployment arm, said second deployment arm having a distal end and a proximal end; a pushrod shaft having a distal end and a proximal end, said pushrod shaft distal end attached to the first deployment arm proximal end and second deployment arm proximal end; and a drive handle; wherein the delivery tube assembly is operably connected to the drive handle, such that manipulation of the drive handle causes translation of the pushrod shaft within the lumen of the delivery tube; and wherein the first deployment arm and second deployment arm are resiliently biased to an open configuration wider than the lumen of the delivery tube, and compressible to a closed configuration in which the deployment arms may be disposed within the lumen of the delivery tube, and each deployment arm comprises a longitudinal slot, running substantially the length of the deployment arm, each said slot being sized to hold a portion of the sheet-like implant by a friction fit between the deployment arm slots and the sheet-like implant.
 2. The delivery system of claim 1 further comprising: a sheet-like implant, with a first portion of said sheet-like implant disposed within the longitudinal slot of the first deployment arm and a second portion of said sheet-like implant disposed with the longitudinal slot of the second deployment arm.
 3. The delivery system of claim 1 wherein the delivery tube assembly is releasably attached to the drive handle.
 4. The delivery system of claim 1 wherein: a portion of the pushrod shaft extends proximally from the proximal end of the delivery tube, the delivery tube assembly further comprises a flange disposed near the proximal end of the delivery tube, and the pushrod shaft further comprises a pin disposed on the portion of the pushrod that extends proximally from the proximal end of the delivery tube; and the drive handle comprises a retainer slot sized and dimensioned to receive the flange, and fix the delivery tube longitudinally to the drive handle; the drive handle further comprises a trigger operably connected to a yoke, to translate the yoke longitudinally relative to the drive handle, and said yoke comprises a longitudinally oriented slot sized and dimensioned to receive the portion of the pushrod that extends proximally from the proximal end of the delivery tube and a transverse slot sized and dimensioned to receive the pin of the pushrod, and fix the pushrod to the yoke, such that, when the delivery tube assembly is attached to the drive handle, manipulation of the trigger causes longitudinal translation of the pushrod within the delivery tube.
 5. The delivery system of claim 4 wherein the pushrod and longitudinal slot of the yoke are configured to rotationally fix the pushrod relative to the drive handle.
 6. The delivery system of claim 2 further comprising: a holder disposed within the lumen of the delivery tube, said holder characterized by a distal end and a proximal end, said holder distal end extending distally from the distal end of the delivery tube, said holder distal end operably connected to a top surface of the sheet-like implant.
 7. The delivery system of claim 1 wherein the delivery tube is rotatable around the pushrod shaft.
 8. The delivery system of claim 1 further comprising: a fluid manifold in fluid communication with the implant delivery tube assembly, said delivery tube further comprising an aperture in a sidewall of the delivery tube near the delivery tube distal end.
 9. The delivery system of claim 1 wherein: a portion of the pushrod shaft extends proximally from the proximal end of the delivery tube, the delivery tube assembly further comprises a flange disposed near the proximal end of the delivery tube; and the drive handle comprises a retainer slot sized and dimensioned to receive the flange, and fix the delivery tube longitudinally to the drive handle; the drive handle further comprises a slide actuator operably connected to the pushrod shaft wherein manipulation of the slide actuator causes longitudinal translation of the pushrod within the delivery tube.
 10. The delivery system of claim 1 wherein the pushrod shaft is bendable near the distal end of the pushrod shaft.
 11. The delivery system of claim 1 wherein the pushrod shaft is hinged near the distal end of the pushrod shaft.
 12. The delivery system of claim 1 further comprising: a delivery needle in fluid communication with a fluid source, said delivery needle disposed within the lumen of the delivery tube, said delivery needle characterized by a distal end and a proximal end, said delivery needle distal end extending distally from the distal end of the delivery tube, said delivery needle proximal end operably connected to the fluid source.
 13. The delivery system of claim 12 wherein the fluid source is a tissue adhesive. 